feat(security): Add ZK-API Proxy (OpenAnonymity) to roadmap

Closes #285. Track OpenAnonymity ZK-API proxy research for anonymized cloud inference in long-term security roadmap (Phase 4.5). Part of Vitalik's Secure LLM Architecture EPIC #281.

docs/reports/SECURITY_MITIGATION_ROADMAP.md

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+
+### 4.5 ZK-API Proxy for Anonymized Cloud Inference (OpenAnonymity)
+**Owner:** Security Engineer  
+**Estimated Effort:** 16 hours  
+**Priority:** P3 (Long-term Research Track)
+
+#### Background
+Based on Vitalik Buterin's Secure LLM Architecture (April 2026), ZK-API proxies provide cryptographically-verified anonymized cloud inference. This protects user queries from being correlated with identities while maintaining model utility.
+
+#### Tasks
+- [ ] Research OpenAnonymity ZK-API proxy protocol and architecture
+- [ ] Evaluate compatibility with Hermes Agent's inference pipeline
+- [ ] Design integration points for anonymized cloud inference fallback
+- [ ] Prototype zero-knowledge proof generation for query anonymization
+- [ ] Benchmark latency and throughput overhead
+- [ ] Document threat model and privacy guarantees
+
+#### References
+- Vitalik's Secure LLMs: https://vitalik.eth.limo/general/2026/04/02/secure_llms.html
+- OpenAnonymity ZK-API proxy specification
+- Related EPIC: #281 (Implementation of Vitalik's Secure LLM Architecture)
+
 ## IMPLEMENTATION TRACKING
 
 | Week | Deliverables | Owner | Status |
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 | 4 | P1 Testing & Documentation | QA/Doc Team | ⏳ Planned |
 | 5-8 | P2 Fixes Implementation | Dev Team | ⏳ Planned |
 | 9-12 | P3/P4 Long-term Improvements | All Teams | ⏳ Planned |
+| 9-12 | P3/P4: 4.5 ZK-API Proxy Research | Security | ⏳ Research |
 
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